Question

In a direct variation, y = 20 when x = 4. Write a direct variation equation that shows therelationship between x and y.Write your answer as an equation with y first, followed by an equals sign.Submit

Answer 1

if y=20 when x=4, there must be a proportionality constant between the numbers.

`20=k\cdot(4)`

find k

`\begin{gathered} k=(20)/(4) \\ k=5 \end{gathered}`

rewrite the expression in terms of x and y

`y=5x`